linux-kernel - Re: [PATCH] fs: run emergency remount on dedicated workqueue

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Message-ID: <4BFEA5CF.2070002@kernel.org>
Date:	Thu, 27 May 2010 19:03:11 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Américo Wang <xiyou.wangcong@...il.com>
CC:	David Howells <dhowells@...hat.com>, davem@...emloft.net,
	jens.axboe@...cle.com, linux-kernel@...r.kernel.org,
	torvalds@...l.org, viro@...IV.linux.org.uk,
	akpm@...ux-foundation.org
Subject: Re: [PATCH] fs: run emergency remount on dedicated workqueue

On 05/27/2010 04:59 PM, Américo Wang wrote:
> On Thu, May 27, 2010 at 11:57:23AM +0200, Tejun Heo wrote:
>> Commit fa4b9074cd8428958c2adf9dc0c831f46e27c193 made s_umount depend
>> on keventd; however, emergency remount schedules works to keventd
>> which grabs s_umount creating a circular dependency.  Run emergency
>> remount on a separate workqueue to break it.
>>
> 
> I have a stupid question, why using workqueue instead of
> calling do_remount_sb() directly in emergency_remount()?
> Avoid blocking emergency_remount()?

Umm... because it's called from interrupt handler?  Right?

-- 
tejun
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